Means for operating chucks.



J. JEGKLIN an c. w. SGHREIBBR. A MEANS FOB OPERATNG BUQKS2 APPLICATION FILED AUG. 17, i903. A

900,856.I Patented oct`.13,19o8.

ATTOI? EY.

Means for perating greater or less ter of the wor operatedon demands, with.

UNITED STATES PATENT oEEicE.

.moon IEcxLIN AND cnA'RLEs WY. scHEEiBER, or DUBUQUE, IOWA. f

IEANS FOB OPERATING CHUCKS.

Patented ott. 13, 190s.

Application lled August 17, Serial No. 169,840.

To allwhom it may concern:

Be 1t known that we, JACOB JECKLIN and CHARLES W. SQHREIBER, -citizens of the United States, residing at Dubu ue,- in the county of Dubuque andState of owa, have. invented new and useful Improvements in following is a specification.

yOne of the objects of our invention is to provide means for operating a chuck or other grasping device by air or other fluids,

whiehsha be simple in constmction,`easily and quickly controlli-idf,v strong and effective in operation and can be removab attached to a hollow'spindle or hollow spin le lathe.

1 Another object is to so. control the power, that the chuck will hold the work by a asp, according as the charac out change of pressure from the source of power. Y Y

It consists essentially in a yoke to which is secu-red a cylinder provided with a piston and valve for admitting the' operating fluid and ada ted to 4be removal; attached to the fluid) su pl It further consists in a lever secured within the yoke and connected with a piston rod of 4 the cylinder and the pull-bar of the spindle die yoke to the spindle.

Figure 1 is a longitudinal section of the and also in means for removably attaching .'.cylinder and spindle of the lathe with a plan view of the yoke attached to. the sgiiudle'.

Figi,

spending parts, in each of the figures'. v

Referring to thedrawings, A designates a lhollow spindle which I have shown as adapted' to fome in bearings B of a mating Spindle lathee D is the driving puiiey mi E the' fame of the lathe. The outer end of the s indle is l screw-threaded Vand there is screwe v thereon va yoke F. This yoke is formed of a frame G rounded atits forward end g and of ,rectan- -gular shape at its rear end and-attached to the Within which is set a packing box H. There is also an opening J through the forward end ofthe yoke which is screw-threaded to it the Chucks, of which ther spindle to which it is vto be removably attached.A l v To the-frame G there is pivoted by pivot frame. These plates -I extend across the yoke nearly to the opposite side. Upon the pivot pin 7c two other lates K similar to the plates l which exten across nearly to the opposite side of the frame. These platesI L and are loosely connected-together by y plates M adapted to be removably secured' in it will be noticed that the outer ends o f the 'plates I and Kare free and do not extend uite to the opposite side of the yoke.

p ates with their connection vform a -compound lever and the power that it is adapted to exert is determined bythe position the through the openings L. To the lates I is pivoted a pull-bar O which exten s through the openings J in the yoke into the spindle A and to the outer end of which is attached a chuck m or some device for holdingthe work.

Wehavc shown a spindle adapted to rotate theehuck m,`but the device can be removably attached to any spindle through which the pull-bar can operate a stationary chuck such as are used for holding Work to lbe drilled and the like, in'which case the an opening therethrough and provided with means for removably. attaching the yoke thereto.

Y The plates K are pivoted by pivot pins to the iston rod P which extends throng Q. To the rear` end of the frame of the yoke Through the stem T is an opening S which connectswith the Huid pressure supply and near the top of the cylinder is another openin s whichl passes down around the inner si e of the cylinder andpar-tly through the stem T and o ens out of the side of the stein T which is a so connected with a fluid supply. Around the end Tis loosely attached a valve (not shown) in which the cylinder is adapted to revolve Whenever the attachment is used with a rotatingV spindle lathe.

The manner of o eratin our. device is substantially as fol ows: T e fluid isv adpins j two plates one on each side of theV opposite side of the yoke are pivoted-'by a..

and K are provided with numerous openings 'spindle-might be only a block or table with' the pac .box H and attached to a piston is attached a cylinder C whichjsjprovided f -with a piston Q and terminates in a stem T.

the openings L at each end by pivot. pins N.

These plates M are pivoted on the plates I and K mitted through the opening S into the cylinder at the base of the piston Q and forces the piston forward and as the piston is forced forward, it moves forward the plates K and this in turn, through the plates M pivoted to the plates I, forces forward the plates I and also forces forward the pull-bar O and separates the jaws U of the chuck.

When the piston has been moved to nearly the forward end of the cylinder, the fluid is admitted through the opening V and passes into the upper side of the piston, through work.

the opening s and draws thevpiston backward and with it the platesand the pull-bar and closes the jaws of the chuck upon the If the work is of such a character that it has to be grasped by the normal pressure power of the fluid, then the platesM are pivoted over the pivot holes p and through the ends of the pull-bar and the piston rod when it will have a direct pull and thrust on the pull-bar. If it is desired to have agreater grasp upon the work, then the plates M are moved to the right of a line of the piston and pull-bar viewed from the rear of the yoke, and pivoted in some oneof the holes L according to the amount of pressure desired. If it is desired to have .a less pressure than the normal, then the Ylates M are pivoted in some one of the ho es L upon the left of the center line of the piston rod and pull-bar. In this manner the pressure upon the pullbar to grasp the chuck can be increased or decreased at will b moving the plates M along on the plates IY and K and the pressure in the cylinder against the piston need not be chan ed but may alwaysremain normal.

It be observed that this attachment can -'be secured toV any hollow' spindle whether it is a rotating spindle or otherwise by simply screwing the yoke to the s iudle andthe pressure upon the work can e increased or decreased at will without any change in the fluid pressure. Having now described our invention, what we desire to secure by Letters Patent is:-

1. In a device of the character described,

-a rotatable yoke, a spindle connected to, and

rotatable with the yoke, apull-bar, a fluidpressure device connected to the yoke and rotatable therewith for operating the pullbar, connections between the pull-bar and the fluid-pressure device, and means connected with the pull-bar and yoke for varyling the pull and thrust on the ull-bar without change in the pressure in t 1e fluid of the fluidressure device.

2. n a device of the character described, a rotatable yoke, a spindle connected to and rotatable with the yoke, a )ull-bar, a rotatable cylinder provided witli a piston, connections between the cylinder and the )ullbar, means for operating the piston by uidpressure, a lever interposed in the pull-bar, and connected with the pull-bar and yoke for varying the pull and thrust of the pullbar without change in the pressure of the fluid, connections between the lever and piston, and means for changing the leverage.

3. In a device of the character described, a yoke, a pull-bar, a chuck provided with jaws coupled to the pull-bar, a lever consisting of plates each ivoted at one end to the opposite sides of tie yoke respectively and provided with means for connecting the plates together at various places along the plates to vary the pressure upon the pull-bar to which the lates are attached, a cylinder attached to t e yoke and provided with a piston, a piston rod connecting one of the plates with the piston, the other plate being connected to t e pull-bar and connection with the fluid-pressure.

4. In a device of the character described, a spindle carrying a chuck, a yoke removably attached to the spindle and rotatable therewith, a pull-bar, connections between the pull-bar and yoke, a fluid-pressure device connected to the yoke and rotatable therewith, consisting of a cylinder and )iston in the cylinder, connections between the piston and the pull-bar, and connections between the fluid-pressure device and the yoke and rotatable with the yoke.

In testimony whereof we have signed our names to this specification in the presence of two subscribing witnesses.

Witnesses:

M. M. CADY, GEORGE YOUNG. 

